B2B - Set Source file name to the DB Target

We want to send the File name picked by our Event to the DB target but where can we get the the input file name?

Tip:

The Source file name is stored in "baseInputFileName" context variable that you can retrieve in Data Mapper by using get-context mapping function. You can apply this mapping rule on the target field in which you want to store the value of Source File Name picked by Event.